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附加作业01
题目1
描述：
PyQt5 完成一个简单的计算器
代码：
import sys,os
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
def openc():
os.system(‘calc.exe‘)
return
def calc_name():
name = nameLine.text()
name = name.replace(‘（‘,‘(‘)
name = name.replace(‘）‘,‘)‘)
name = name.replace(‘PI‘,‘3.1415926‘)
name = name.replace(‘pai‘,‘3.1415926‘)
name = name.replace(‘π‘,‘3.1415926‘)
name = name.replace(‘pi‘,‘3.1415926‘)
name = name.replace(‘e‘,‘2.71828‘)
name = name.replace(‘E‘,‘*10**‘)
name = name.replace(‘^‘,‘**‘)
if name == ‘‘:
QMessageBox.information(nameLine,‘blank inputing‘,‘please input‘)
return
else:
b = eval(name)
QMessageBox.information(nameLine,‘Done!‘,‘result: {:.2f}‘.format(b))
app = QApplication(sys.argv)
Enter = QWidget()
nameLabel = QLabel(‘calculate:‘)
nameLine = QLineEdit(Enter)
EnterButton = QPushButton(‘Enter‘,Enter)
CalcButton = QPushButton(‘Calc‘,Enter)
subLayout =QHBoxLayout()
subLayout.addWidget(CalcButton)
subLayout.addStretch(1)
subLayout.addWidget(EnterButton)
bodyLayout = QVBoxLayout()
bodyLayout.addWidget(nameLabel)
bodyLayout.addWidget(nameLine)
bodyLayout.addLayout(subLayout)
EnterButton.clicked.connect(calc_name)
CalcButton.clicked.connect(openc)
Enter.setLayout(bodyLayout)
Enter.setGeometry(300,200,400,100)
Enter.setWindowTitle(‘calculation‘)
Enter.show()
sys.exit(app.exec_())
题目2
描述：网页的保存
代码：
#!user/bin/python 3.5.2
#-*- encoding=utf-8 -*-
import requests
import os
url=input(‘please input a url:‘)
print (‘hold on several seconds‘)
if url[0:4]!="http":
url=‘http://‘+url
kv={‘user-agent‘:‘Mozilla/5.0‘}
r=requests.get(url,headers =kv)
r.raise_for_status()
r.encoding=r.apparent_encoding
ans=input(‘save the webpage？(y or n)‘)
if ans==‘y‘:
root=input(‘please input a path to save the webpage:‘)
path=root+url.split(‘/‘)[-1]+‘.html‘
if not os.path.exists(root):
os.mkdir(root)
if not os.path.exists(path):
with open(path,‘wb‘) as f:
f.write(r.content)
f.close()
print(‘success!‘)
else:
print(‘the file has existed‘)
附加作业01
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